Brake shoe



V. BENDIX Feb. 23, 1932.

BRAKE SHOE Original Filed Aug. 4, 1926 INVENTOR BENDIX BY VINCENT ATTORNEY Patented Feb. '23, 1932 UNITED STATES PATENT OFFICE VINCENT BENDIX, OF SOUTH BEND, INDIANA, ASSIGNOR TO BENLDIX BRAKE COI- PANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE SHOE Application filed August 4, 1926, Serial No. 126,959. Renewed Kay 20, 1981.

This invention relates to brakes, and is illustrated as embodied in an internal expanding automobile brake. An important object of the invention is to construct the shoe 5 in a novel manner, to enhance its lightness and strength, and at the same time to lessen the cost of manufacture. The novel shoe also has a very pleasing appearance.

I prefer to construct the shoe by attaching 10 to an outer arcuate part, which may carry the lining or which may itself be a section of metal brake lining, a stiffening member having inte ral tongues forming the attaching means. In order to form inclined braces, the tongues may diverge at acute angles from the plane of the stiiiening member, preferably alternating on opposite sides thereof. It is very desirable to bend the end of each tongue toward the side edge of the shoe, forming it on an arc lengthwise of the shoe, so that it fits closely against the inner face of the outer part.

An important feature of novelty relates to securing the outer part and the stiff-ening member, and preferably also the lining, together by a sin le series of fastenings, so that the assembly oi the shoe and the attaching of the lining may take place simultaneously, thus simplifying the assembly and lessening the cost of manufacture.

Other desirable features relate to a bracing member for the end of the arcuate outer part, which member in one embodiment is integral with a novel cam thrust plate, and to a sepa rate member bracing the other end of the shoe and cooperating with one end of the stiffening member to form a pair of spaced pivot arms, and to the particular arrangement of the above-described bracing tongues, especially in their relation to openings through the stifi'ening member. These and other novel combinations of parts and desirable particular details of construction will of the illustrative embodiment shown in the accompanying drawings, in which: I

Figure 1 is a vertical section through the brake, ust inside the head of the brake drum,

showing the novel shoes in side elevation;

Figure 2 is an inside development of one be apparent from the followingdescription end shoe; i. e. it is an inside view of one end shoe as it would look if straightened out;

Figure 3 is a similar inside development of the center shoe; Figure 4 is a section on the line 4-4 of Figure ,2, showing the novel thrust member at the end of the shoe;

Figure 5 is a section through one of the Shoes,d for example on the line 5-5 of Figure Figure 6 is a View corresponding to Figure 5, but showing ashoe with metal lining. The brake shown in Figure 1 includes a rotat-able drum 10, at the open side of which is a support such as a backing plate 12, and within which are arranged three shoes 14, 16, and 18. Shoes 14 and 18 are preferably inter changeable. Shoes 14 and 18 have spaced arms at their ends straddling opposite ends of shoe 16, and connected thereto by pivots or the like 20-and 22. Shoe 16 is anchored on a pivot 24 carried by the backing plate, and passingithrou'gh relatively large openings 26 in the arms at the end of shoe 14. The brake is applied by means such as a double cam 28,

against the resistance of a return spring 30,

and shoe 16 is applied by shoes 14 and 18 principally the latter) against the resistance of an auxillary return spring 34.

The present invention relates to the construction of shoes 14, 16, and 18, to make them lighter, stronger, and cheaper, and at the same time to enhance their appearance. Part of the subject-matter of the present application is disclosed in my prior co-pe-nding application No. 110,632, filed May 21, 1926, such subject-matter being continued herein from said prior application.

Each of the shoes includes an outer arcuate or cylindricallyecurved band 'or supporting member 36, carrying the brake lining 38, or

' in lieu thereof an arcuate piece of metal brake lining 40 (Figure 6) of bronze or other metal having an adequate coefficient of friction. On the'inner side of the band 36 or 40 is arranged a stiffening member 42, slotted inwardly from its outer edge to form tongues 44 which are bent at acute angles to the plane of the stiifening member to form inclined braces ens gaging the inner face of part36. The outer ends of tongues 44 are bent to extend toward the side edges of part 36, and are curved cylindrically lengthwise of the shoe, to fit closely against the inner face of part 36 (or 40) Alternate tongues 44 are inclined in opposite directions from the plane of the stiffening member 42, so that both sides of band 36 are adequately supported.

According to an important feature of the invention, a single set of rivets or other fastenings 46 forms the sole means securing lining 38 to band 36, and band 36 to the stiffening member 42. In making the shoe, the lining and band and stiffening member are clamped in a suitable fixture, while the fastenings are inserted. This eliminates the step of securing band 36 and member 42 together before attaching the lining. However, if preferred,

one or two tongues 44 may be spot-welded to band 36 as a preliminary fastening, leaving the lining fastenings 46 'to constitute the means for permanently securing these two parts together.

' At the cam end of each of the shoes 14 and 18 is arranged a novel thrust member 48 doubled on itself to form parts 50 engaging and secured to opposite sides of member 42 at its end. I prefer to extend one of the parts 50, as shown in Figure 4, to form a tongue 52 similar to the tongues 44, and supporting the end of band 36 at the side opposite the last tongue 44.

Where the openings 26 come in member 42, a radially straight or plane portion 54 is left, and is arranged to engage part of the band 36 along its outer edge to support it at its center.

In order to form the spaced arms at the lower ends of shoes 14 and 18, the stiffening member 42 may be deflected to one side of the center of the shoe just above opening 26 (see Figure 2), and projected beyond the end of part 36 as a pivot arm 56. The last tongue 44 on this part of member 42 supports the end of part 36 at one side. A sep-. arate part 58 is secured to member 42 at the point where it is deflected, and is offset therefrom and projected beyond the end of the shoe to form the other pivot arm 60. This part 58 is shown formed with tongues 62 on opposite sides of opening 26, and similar to tongues 44, and the second of which supports the end of band 36 at the side opposite the last tongue 44. Arms 56 and 60 may have integrally-drawn bearings 64 to embrace the pivot 20 or 22.

Shoe 16 has no cam plate at its end, and to support the side of band 36 at its ends opposite the end tongues 44 it is provided with inclined strips or braces 66 similar to the tongues except that they are separate pieces. Member 42 of shoe 16 is provided with three bushings 68 for pivots 20 and 22and anchor 24 While an illustrative construction has been described in detail, it is not my intention to cylindrically-curved outer limit the scope of the invention to that par ticular construction, or otherwise than by the terms of the appended claims.

I claim:

1. A brake shoe having, in combination, a cylindrically-curved outer band, a stiffening device on the inner side of said band, friction lining on the outer face of the band, and fastenings passing directly through the lining and the band and through a part of said stiffening device and forming the sole means of securing the lining to the band and the sole means of securing the band to the stifi'ening device.

2. A brake shoe having, in combination, a band, a stifie'ning device on the inner side of said band, friction lining on the outer face of the band, and fastenings passing directly through the lining and the band and through a part of said stiffening device and forming the sole means of securing the lining to the band.

3. A brake shoe comprising three principal parts, viz.: (1) an arcuate band, (2) friction lining on the face of the band, and (3) a stiffening device engaging the band op 30- site the lining, together with a series of astenings, all of which pass through the lining and the band and the stiffening device and which hold said three principal parts together.

4. A brake shoe comprising, in combination, an arcuate outer part, a separate stiffening member having tongues extending toward the opposite side edges of said outer part and secured thereto, and a brace member opposite the tongue at the end of the shoe and connecting the stiffening member and the outer part. 7

5. A brake shoe comprising, in combination, an arcuate outer part, a separate stifi'ening member having tongues extending toward the opposite side edges of said outer part and secured thereto, and a brace member opposite the tongue at the end of the shoe and connecting the stiffening member and the outer part, said brace member having a part at the end of the shoe arranged to serve as a thrust part to be engaged by a brake-applying device.

6. -A brake shoe comprising, in combination, an arcuate outer part, a separate stiffening member having tongues extending toward the opposite side edges of said outer part and secured thereto, and a brace member opposite the tongue at the end of the shoe and connecting the stilfening member and the outer part, said brace member having an integral portion extending across the end of the shoe and arranged to serve as a thrust part to be engaged by a brake-applying device.

7. A brake shoe having an arcuate outer part and a stifl'ening web, in combination with a thrust member at the end of the shoe 1 having parts engaging and secured to opposite sides of the end of said web, and at least one of which parts is extended into en agementwith the outer part to serve as a race therefor.

8. A brake shoe having an arcuate outer part and a stifiening member having tongues secured to the inner face of said part and extending beyond the end thereof, together with a separate part projecting beyond said end generally parallel to the projecting portion of the stiffening member, said separate part and said projecting portion forming spaced pivot arms for the shoe.

9. A brake shoe having an arcuate outer part and a stiffening member having tongues secured to the inner face of said part and extending beyond the end thereof, together with a separate part projecting beyond said end, said separate part and the projecting portion forming pivot means for the shoe, and said separate part and said stiffening member having tongues respectively supporting the op posite sides of the outer part at its said end.

10. A brake shoe having, in combination, an arcuate outer part, a stiffening member approximately in the central plane of said part and deflected to one side of said plane near the end of the shoe and having a tongue supporting the side of the outer part at said end and a separate part extending toward said end of the shoe from the point where the stiffening member is deflected and having a tongue supporting the other side of the outer part at said end.

11. A brake shoe comprising, in combination, an arcuate outer part, and a stiffening member secured thereto and including a portion engaging with its outer ed e the inner surface of said outer part and ormed with a transverse opening, said member having tongues on opposite sides of said opening, each of which is secured to the inner face of the outer part near its side edge.

12. A brake shoe comprising, in combination, an arcuate outer part, and a stiffening member secured thereto and including a portion engaging with its outer edge the inner surface of said outer part and formed with a transverse opening, said member having tongues on opposite sides of said opening, each of which is secured to the inner face of the outer part near its side edge, saidltongues being inclined to the plane of said member to form inclined braces for the outer part.

one side, a friction lining upon the oppositeside of the band, and fastening means extending through the three members securing them together.

16. A brake shoe comprising, in combination an arcuate outer part, and a stiffening device having integral tongues diverging from its plane at acute angles to engage said outer part.

17. A brake shoe comprising, in combina tion, an arcuate outer part, and a stiffening device having integral tongues alternately bent in opposite directions and diverging from the plane of said device at acute angles to engage said outer part.

18. A brake shoe comprising an arcute band portion supported upon a radial stiffening portion having inclined integral tongues projecting from opposite sides and engaged with the band portion.

19. A brake shoe comprising an outer arcuate band supported upon a radially extending stiffening web provided with inclined tongues projecting generally laterally therefrom into engagement. with the band beyond the plane of the web.

In testimony whereof, I have hereunt signed my name.

VINCENT BENDIX.

13. A brake shoe including separate web and band members secured together and forming a structure generally T-shaped in cross section, in combination with a reinforcing angle-shaped member having one portion secured to the side of the web member and another portion secured to the inner face of the band member.

14. A brake shoe comprising a band, a 

